Want some help seeing the sights of the world? Tour guides are ready to help you explore cities, deserts, caves and rivers by foot, bus, bike and boat. Click on to see the world's top 25 guided tours, according to website Gogobot Traveler. Here's the full list, in descending order.

Want some help seeing the sights of the world? Tour guides are ready to help you explore cities, deserts, caves and rivers by foot, bus, bike and boat. Click on to see the world's top 25 guided tours, according ... more

Photo: OLLI GEIBEL, AFP/Getty Images

Want some help seeing the sights of the world? Tour guides are... Photo-4551757.61392 - SFGate